Portable Device Case Magnet Screen Control
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Solution Overview
Problem
Existing portable device cases struggle to automatically turn screens on and off without manual button manipulation, leading to battery consumption issues and manufacturing inefficiencies due to reliance on proximity or illuminance sensors, which are not reliable for all scenarios.
Innovation Solution
A protective case with a magnet part that applies a controlled magnetic field to the geomagnetic sensor of a portable device, allowing the screen to be turned on and off by opening or closing the cover, utilizing a magnetic field strength range of 1200 to 1999 uT to interact with the geomagnetic sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a magnet part is incorporated in the cover portion to enable automatic screen on/off control, then the ease of operation is improved, but magnetic field interference may cause erroneous screen operations
Solution Approach 1:
The patent applies parameter changes by setting specific magnetic field strength thresholds (1200-1999 uT for screen off, -1999 to -1200 uT for screen on) to distinguish between intentional cover operations and accidental interference. This quantitative parameter-based control resolves the contradiction by enabling automatic operation while preventing erroneous actions through calibrated detection criteria.
Solution Approach 2:
The patent implements feedback mechanisms where the geomagnetic sensor continuously monitors magnetic field strength, and the control program adjusts screen state based on detected field changes. This closed-loop feedback system ensures reliable operation by confirming magnetic field changes meet predetermined thresholds before triggering screen state transitions, preventing false activations.
2Measurement precision
If the magnet part is positioned to face the geomagnetic sensor for effective detection, then the measurement precision is improved, but the device complexity increases due to precise positioning requirements
Solution Approach 1:
The patent applies universality by utilizing the existing geomagnetic sensor, which is already incorporated in portable devices for compass functions. This multi-functional use of the sensor eliminates the need for dedicated screen control sensors, reducing device complexity while maintaining measurement precision through the sensor's existing capabilities.
Solution Approach 2:
The patent employs parameter changes by establishing specific magnetic field strength ranges (1200-1999 uT) that account for variations in magnet positioning and sensor sensitivity. This parameter-based approach provides tolerance for positioning variations, achieving reliable detection without requiring extremely precise magnet placement.
3Use of energy by moving object
If the screen is turned off automatically when the cover is closed, then the energy consumption is reduced, but the loss of time occurs due to screen activation delay
Solution Approach 1:
The patent applies preliminary action by detecting magnetic field changes before the user needs the screen, and pre-loading the screen activation state. When the cover is opened and magnetic field changes are detected, the screen turns on immediately without delay, as the system is already prepared to activate based on the predetermined control logic and threshold settings.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables intuitive screen control without direct button manipulation, reduces battery consumption, and simplifies manufacturing by leveraging existing geomagnetic sensors, ensuring reliable screen operation across various environments.
Implementation Method 1
incorporates a magnet at a location corresponding to that of a geomagnetic sensor incorporated in a portable device, analyzes a signal applied by the magnet
Data Source
AI summary
The present invention relates to a protective case incorporating a magnet in a portion facing a magnetism sensor of a portable device, and to a method for controlling the action of turning the screen of the portable device on and off by using same, and relates to an invention for providing a function whereby it is possible to automatically turn the screen on and off depending on the action of the screen-protecting cover of the case, through the use of a method involving the incorporation of a geomagnetic sensor and of a magnet in a position corresponding thereto.